What if there were another advanced species?

What if Neanderthals, who bit the dust just 28,000 years ago, had instead wised up and were now living next door? Or what if, during all these millennia that humans have been evolving, some unrelated creature had evolved cognitive and technological prowess in keeping with our own? Another scenario: what if humans had split into two separate species ? the original gangsters, and a successful evolutionary offshoot?

Source: http://www.msnbc.msn.com/id/3036697/vp/46087799#46087799

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